So what [can be said] of those who fall into obscene acts and major sins?!
If you see a person upon truth, and another upon falsehood, then you must aid the truth and warn against the falsehood, otherwise [it is as if] you are dead; you do not know [that which is] good and do not detest [that which is] evil.
I often sit in the company of other women, and often is the case that there is backbiting in these gatherings. And I feel very agitated by this, and dislike it, however, I am unable to actually do anything about it; I can’t even leave the gathering.
When Ibn Qudaamah would hear of any evil [taking place], he would strive to prevent it from happening again.
What is the ruling if you say to a man or a woman that, “What you are doing is haraam”, such as telling a woman not to wear short clothes, or telling a man not to smoke cigarette?